4-nitrobenzyl (4R,5S,6S)-3-[(diphenylphosphono)oxy]-6-[(R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate 、
(3S)-3-mercapto-N-aminosulfonyl-pyrrolidine 以to give 4.5 g of product with a yield of 55.2%的产率得到p-nitrobenzyl (4R,5S,6S)-3-[(3S)-N-aminosulfonylpyrrolidin-3-yl]thio-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-aza-bicyclo[3.2.0 ]hept-2-ene-2-carboxylate